RDS licensing for VDA

Hi,

I need to deploy a terminal server and then 10 'windows 7' VMs to it. I dont need to use any remote apps?

I am very confused about the licensing part.

From what I understand I need to buy a license for the licensing server and 10 "Windows 7 VDA" licenses.

Do I need to buy and RDS-CAL or any other licenses as well?

Thanks.

Bhavya